Question

Дам 20 балов кто решит

Answer 1

1) $(sqrt{3}$ -1) * $(sqrt{3}$ +1) = 3-1= 2

2) 7x²+20 x -3 = 0

7x²+21x-x-3=0

7x · (x+3) - (x+3) = 0

(x+3) * (7x-1) =0

x+3=0

7x-1 = 0

x=-3

x=1/7

x₁ = -3, х₂